(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
PARAMETERS
293
5
GROUP
F
NOTE
• At a start, the motor starts at Pr.13 Starting frequency when the start signal turns ON.
• If there is a difference between the speed command and speed at a start of deceleration due to torque limit operation etc., the
speed command is matched with the speed to make deceleration.
• Change the X20 signal after the speed becomes constant.
• S pattern operation before switching continues even if the X20 signal is changed during acceleration or deceleration.
• The X20 signal can be assigned to an input terminal by setting any of Pr.178 to Pr.189 (input terminal function selection).
Changing the terminal assignment may affect other functions. Set parameters after confirming the function of each terminal.
S-pattern acceleration/deceleration D (Pr.29 = "5", Pr.516 to Pr.519)
• Set the time required for S-pattern operation part of S-pattern acceleration/deceleration with Pr.516 to Pr.519.
Set each S-pattern operation time for acceleration start (Pr.516), acceleration completion (Pr.517), deceleration start
(Pr.518), and deceleration completion (Pr.519).
• When S-pattern acceleration/deceleration D is set, the acceleration/deceleration time becomes longer, as shown below.
The set acceleration/deceleration time T1 indicates the actual time taken for linear acceleration/deceleration as calculated
based on Pr.7, Pr.8, Pr.44, Pr.45, Pr.110, and Pr.111.
NOTE
• Even if the start signal is turned OFF during acceleration, the inverter will not decelerate immediately to avoid sudden
frequency change. (Likewise, the inverter will not immediately accelerate when deceleration is changed to re-acceleration by
turning the start signal ON during deceleration, etc.)
• For example, the following table shows the actual acceleration time when starting the inverter by selecting S-pattern
acceleration/deceleration D from a stop to 60 Hz, as shown below, with the initial parameter settings.
Actual acceleration time T2 = set acceleration time T1 + (S-pattern time at start of acceleration + S-pattern time at
completion of acceleration) / 2
Actual deceleration time T2 = set deceleration time T1 + (S-pattern time at start of deceleration + S-pattern time at
completion of deceleration) / 2
Set acceleration time T1 = (set frequency - Pr.13) Pr.7 / Pr.20
= (60 Hz - 0.5 Hz) 5 s / 60 Hz
4.96 s (actual acceleration time at linear acceleration)
Actual acceleration time T2 = set acceleration time T1 + (Pr.516 + Pr.517) / 2
= 4.96 s + (0.1 s + 0.1 s) / 2
= 5.06 s (acceleration time at S-pattern acceleration)
Pr.516
Time
Output frequency
Output frequency
ON
ONStart signal
Start signal
Pr.517 Pr.518 Pr.519
T2
Acceleration/deceleration
reference frequency (Pr. 20)
T1
Starting frequency
(Pr. 13)
Pr. 517/2
Pr. 517
Pr. 516
Pr. 516/2
Linear acceleration
Slope of Pr. 7, Pr. 44, Pr. 110
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